基于MATLAB的车牌识别系统的源代码(可以实现).zip_plate recognition_matlab车牌识别_图形图像处理

<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta charset="utf-8"> <meta name="generator" content="pdf2htmlEX"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <link rel="stylesheet" href="https://static.pudn.com/base/css/base.min.css"> <link rel="stylesheet" href="https://static.pudn.com/base/css/fancy.min.css"> <link rel="stylesheet" href="https://static.pudn.com/prod/directory_preview_static/626769224c65f412596a5184/raw.css"> <script src="https://static.pudn.com/base/js/compatibility.min.js"></script> <script src="https://static.pudn.com/base/js/pdf2htmlEX.min.js"></script> <script> try{ pdf2htmlEX.defaultViewer = new pdf2htmlEX.Viewer({}); }catch(e){} </script> <title></title> </head> <body> <div id="sidebar" style="display: none"> <div id="outline"> </div> </div> <div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/626769224c65f412596a5184/bg1.jpg"><div class="c x0 y1 w2 h2"><div class="t m0 x1 h3 y2 ff1 fs0 fc0 sc0 ls0 ws0">clc</div><div class="t m0 x1 h3 y3 ff1 fs0 fc0 sc0 ls0 ws0">clear</div><div class="t m0 x1 h3 y4 ff1 fs0 fc0 sc0 ls0 ws0">close all</div><div class="t m0 x1 h3 y5 ff1 fs0 fc0 sc0 ls0 ws0">I=imread('chepai.jpg');</div><div class="t m0 x1 h4 y6 ff1 fs0 fc0 sc0 ls0 ws0">subplot(3,2,1);imshow(I), title('<span class="ff2">原始图像</span>');</div><div class="t m0 x1 h3 y7 ff1 fs0 fc0 sc0 ls0 ws0">I_gray=rgb2gr<span class="_ _0"></span>ay(I);</div><div class="t m0 x1 h4 y8 ff1 fs0 fc0 sc0 ls0 ws0">subplot(3,2,2),imshow(I_gray),title('<span class="ff2">灰度图像</span>');</div><div class="t m0 x1 h4 y9 ff1 fs0 fc1 sc0 ls0 ws0">%====================<span class="_ _1"></span>== <span class="ff2">形态学预处理</span> ============<span class="_ _1"></span>==========</div><div class="t m0 x1 h3 ya ff1 fs0 fc0 sc0 ls0 ws0">I_edge=edge(I_gray<span class="_ _2"></span>,'sobel');</div><div class="t m0 x1 h4 yb ff1 fs0 fc0 sc0 ls0 ws0">subplot(3,2,3),imshow(I_edge),title('<span class="ff2">边缘检测后图像</span>');</div><div class="t m0 x1 h3 yc ff1 fs0 fc0 sc0 ls0 ws0">se=[1;1;1]; </div><div class="t m0 x1 h3 yd ff1 fs0 fc0 sc0 ls0 ws0">I_erode=imerode(I_edge,se); </div><div class="t m0 x1 h4 ye ff1 fs0 fc0 sc0 ls0 ws0">subplot(3,2,4),imshow(I_erode),title('<span class="ff2">腐蚀后边缘图像</span>');</div><div class="t m0 x1 h3 yf ff1 fs0 fc0 sc0 ls0 ws0">se=strel('rectangle',[25,25]); </div><div class="t m0 x1 h4 y10 ff1 fs0 fc0 sc0 ls0 ws0">I_close=imclose(I_erode,se); <span class="fc1">%<span class="ff2">图像闭合、填充图像</span></span></div><div class="t m0 x1 h4 y11 ff1 fs0 fc0 sc0 ls0 ws0">subplot(3,2,5),imshow(I_close),title('<span class="ff2">填充后图像</span>');</div><div class="t m0 x1 h4 y12 ff1 fs0 fc0 sc0 ls0 ws0">I_final=bwareaopen(I_close,2000); <span class="fc1">%<span class="ff2">去除聚团灰度值小于<span class="_ _3"> </span></span>2000<span class="_ _3"> </span><span class="ff2">的部分</span></span></div><div class="t m0 x1 h4 y13 ff1 fs0 fc0 sc0 ls0 ws0">subplot(3,2,6),imshow(I_final),title('<span class="ff2">形态滤波后图像</span>');</div><div class="t m0 x1 h4 y14 ff1 fs0 fc1 sc0 ls0 ws0">%====================<span class="_ _1"></span>====== <span class="ff2">车牌分割</span> ==========<span class="_ _1"></span>===================</div><div class="t m0 x1 h3 y15 ff1 fs0 fc0 sc0 ls0 ws0">I_new=zeros(size(I_final,1),size(I_final,2));</div><div class="t m0 x1 h3 y16 ff1 fs0 fc0 sc0 ls0 ws0">location_of_1=[];</div><div class="t m0 x1 h4 y17 ff1 fs0 fc0 sc0 ls0 ws0">for i=1:size(I_final,1) %<span class="ff2">寻找二值图像中白的点的位置</span></div><div class="t m0 x1 h3 y18 ff1 fs0 fc0 sc0 ls0 ws0"> for j=1:size(I_final,2)</div><div class="t m0 x1 h3 y19 ff1 fs0 fc0 sc0 ls0 ws0"> if I_final(i,j)==1;</div><div class="t m0 x1 h3 y1a ff1 fs0 fc0 sc0 ls0 ws0"> newlocation=[i,j];</div><div class="t m0 x1 h3 y1b ff1 fs0 fc0 sc0 ls0 ws0"> location_of_1=[location_of_1;newlocation]; </div><div class="t m0 x1 h3 y1c ff1 fs0 fc0 sc0 ls0 ws0"> end</div><div class="t m0 x1 h3 y1d ff1 fs0 fc0 sc0 ls0 ws0"> end</div><div class="t m0 x1 h3 y1e ff1 fs0 fc0 sc0 ls0 ws0">end</div><div class="t m0 x1 h3 y1f ff1 fs0 fc0 sc0 ls0 ws0">mini=inf;maxi=0;</div><div class="t m0 x1 h3 y20 ff1 fs0 fc0 sc0 ls0 ws0">for i=1:size(location_of_1,1)</div><div class="t m0 x1 h4 y21 ff1 fs0 fc1 sc0 ls0 ws0">%<span class="ff2">寻找所有白点中，</span>x<span class="_ _3"> </span><span class="ff2">坐标与<span class="_ _3"> </span></span>y<span class="_ _4"> </span><span class="ff2">坐标的和最大，最小的两个点的位置</span></div><div class="t m0 x1 h3 y22 ff1 fs0 fc0 sc0 ls0 ws0"> temp=location_of_1(i,1)+location_of_1(i,2);</div><div class="t m0 x1 h3 y23 ff1 fs0 fc0 sc0 ls0 ws0"> if temp<mini</div><div class="t m0 x1 h3 y24 ff1 fs0 fc0 sc0 ls0 ws0"> mini=temp;</div><div class="t m0 x1 h3 y25 ff1 fs0 fc0 sc0 ls0 ws0"> a=i;</div><div class="t m0 x1 h3 y26 ff1 fs0 fc0 sc0 ls0 ws0"> end</div><div class="t m0 x1 h3 y27 ff1 fs0 fc0 sc0 ls0 ws0"> if temp>maxi</div><div class="t m0 x1 h3 y28 ff1 fs0 fc0 sc0 ls0 ws0"> maxi=temp;</div><div class="t m0 x1 h3 y29 ff1 fs0 fc0 sc0 ls0 ws0"> b=i;</div></div></div><div class="pi" data-data='{"ctm":[1.611850,0.000000,0.000000,1.611850,0.000000,0.000000]}'></div></div> </body> </html>

<div id="pf2" class="pf w0 h0" data-page-no="2"><div class="pc pc2 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/626769224c65f412596a5184/bg2.jpg"><div class="c x0 y1 w2 h2"><div class="t m0 x1 h3 y2 ff1 fs0 fc0 sc0 ls0 ws0"> end</div><div class="t m0 x1 h3 y3 ff1 fs0 fc0 sc0 ls0 ws0">end</div><div class="t m0 x1 h4 y2a ff1 fs0 fc0 sc0 ls0 ws0">first_point=location_of_1(a,:); <span class="fc1">%<span class="ff2">和最小的点为车牌的左上角</span></span></div><div class="t m0 x1 h4 y2b ff1 fs0 fc0 sc0 ls0 ws0">last_point=location_of_1(b,:); <span class="fc1"> %<span class="ff2">和最大的点为车牌的右下角</span></span></div><div class="t m0 x1 h4 y2c ff1 fs0 fc0 sc0 ls0 ws0">x1=first_point(1)+4; <span class="fc1"> %<span class="ff2">坐标值修正</span></span></div><div class="t m0 x1 h3 y2d ff1 fs0 fc0 sc0 ls0 ws0">x2=last_point(1)-4;</div><div class="t m0 x1 h3 y7 ff1 fs0 fc0 sc0 ls0 ws0">y1=first_point(2)+4;</div><div class="t m0 x1 h3 y2e ff1 fs0 fc0 sc0 ls0 ws0">y2=last_point(2)-4;</div><div class="t m0 x1 h3 y2f ff1 fs0 fc0 sc0 ls0 ws0">I_plate=I(x1:x2,y1:y2);</div><div class="t m0 x1 h4 y9 ff1 fs0 fc0 sc0 ls0 ws0">I_plate=OTSU(I_plate); <span class="fc1">%<span class="ff2">以<span class="_ _3"> </span></span>OTSU<span class="_ _4"> </span><span class="ff2">算法对分割出的车牌进行自适应二值化处理</span></span></div><div class="t m0 x1 h3 ya ff1 fs0 fc0 sc0 ls0 ws0">I_plate=bwareaopen(I_plate,50);</div><div class="t m0 x1 h4 yb ff1 fs0 fc0 sc0 ls0 ws0">figure,imshow(I_plate),title('<span class="ff2">车牌提取</span>') <span class="fc1">%<span class="ff2">画出最终车牌</span></span></div><div class="t m0 x1 h4 ye ff1 fs0 fc1 sc0 ls0 ws0">%====================<span class="_ _1"></span>===== <span class="ff2">字符分割</span> ============<span class="_ _1"></span>================</div><div class="t m0 x1 h4 y30 ff1 fs0 fc0 sc0 ls0 ws0">X=[]; <span class="fc1">%<span class="ff2">用来存放水平分割线的横坐标</span></span></div><div class="t m0 x1 h3 y31 ff1 fs0 fc0 sc0 ls0 ws0">flag=0;</div><div class="t m0 x1 h3 y32 ff1 fs0 fc0 sc0 ls0 ws0">for j=1:size(I_plate,2) </div><div class="t m0 x1 h3 y33 ff1 fs0 fc0 sc0 ls0 ws0"> sum_y=sum(I_plate(:,j));</div><div class="t m0 x1 h4 y13 ff1 fs0 fc0 sc0 ls0 ws0"> if logical(sum_y)~=flag <span class="fc1">%<span class="ff2">列和有变化时，记录下此列</span></span></div><div class="t m0 x1 h3 y34 ff1 fs0 fc0 sc0 ls0 ws0"> X=[X j];</div><div class="t m0 x1 h3 y35 ff1 fs0 fc0 sc0 ls0 ws0"> flag=logical(sum_y);</div><div class="t m0 x1 h3 y36 ff1 fs0 fc0 sc0 ls0 ws0"> end</div><div class="t m0 x1 h3 y15 ff1 fs0 fc0 sc0 ls0 ws0">end</div><div class="t m0 x1 h3 y16 ff1 fs0 fc0 sc0 ls0 ws0">figure</div><div class="t m0 x1 h3 y37 ff1 fs0 fc0 sc0 ls0 ws0">for n=1:7 </div><div class="t m0 x1 h4 y38 ff1 fs0 fc0 sc0 ls0 ws0"> char=I_plate(:,X(2*n-1):X(2*n)-1);<span class="fc1"> %<span class="ff2">进行粗分割</span></span></div><div class="t m0 x1 h4 y39 ff1 fs0 fc0 sc0 ls0 ws0"> for i=1:size(char<span class="_ _0"></span>,1) <span class="fc1">%<span class="ff2">这两个<span class="_ _4"> </span></span>for<span class="_ _4"> </span><span class="ff2">循环对分割字符的上下进行裁剪</span></span></div><div class="t m0 x1 h3 y1a ff1 fs0 fc0 sc0 ls0 ws0"> if sum(char(i,:))~=0</div><div class="t m0 x1 h3 y1b ff1 fs0 fc0 sc0 ls0 ws0"> top=i;</div><div class="t m0 x1 h3 y1c ff1 fs0 fc0 sc0 ls0 ws0"> break</div><div class="t m0 x1 h3 y1d ff1 fs0 fc0 sc0 ls0 ws0"> end</div><div class="t m0 x1 h3 y1e ff1 fs0 fc0 sc0 ls0 ws0"> end</div><div class="t m0 x1 h3 y1f ff1 fs0 fc0 sc0 ls0 ws0"> for i=1:size(char<span class="_ _0"></span>,1)</div><div class="t m0 x1 h3 y20 ff1 fs0 fc0 sc0 ls0 ws0"> if sum(char(size(char<span class="_ _2"></span>,1)-i,:))~=0</div><div class="t m0 x1 h3 y3a ff1 fs0 fc0 sc0 ls0 ws0"> bottom=size(char<span class="_ _0"></span>,1)-i;</div><div class="t m0 x1 h3 y22 ff1 fs0 fc0 sc0 ls0 ws0"> break</div><div class="t m0 x1 h3 y23 ff1 fs0 fc0 sc0 ls0 ws0"> end</div><div class="t m0 x1 h3 y24 ff1 fs0 fc0 sc0 ls0 ws0"> end</div><div class="t m0 x1 h3 y25 ff1 fs0 fc0 sc0 ls0 ws0"> char=char(top:bottom,:);</div><div class="t m0 x1 h3 y26 ff1 fs0 fc0 sc0 ls0 ws0"> subplot(2,4,n);imshow(char);</div><div class="t m0 x1 h4 y3b ff1 fs0 fc0 sc0 ls0 ws0"> char=imresize(char<span class="_ _2"></span>,[32,16<span class="_ _1"></span>],'nearest');<span class="fc1"> %<span class="ff2">归一化为<span class="_ _3"> </span></span>32*16<span class="_ _4"> </span><span class="ff2">的大小，以便模板匹配</span></span></div><div class="t m0 x1 h4 y3c ff1 fs0 fc0 sc0 ls0 ws0"> eval(strcat('Char_',num2str(n),'=char;')); <span class="fc1">%<span class="ff2">将分割的字符放入<span class="_ _3"> </span></span>Char_i<span class="_ _3"> </span><span class="ff2">中</span></span></div><div class="t m0 x1 h3 y29 ff1 fs0 fc0 sc0 ls0 ws0">end</div></div></div><div class="pi" data-data='{"ctm":[1.611850,0.000000,0.000000,1.611850,0.000000,0.000000]}'></div></div>